JPH08171854A - Manufacture of filter pattern - Google Patents

Abstract

PURPOSE: To enable a filter to be manufactured by applying pigment particles and a high molecular salt solution on a base plate and drying it, exposing it into the specified pattern, and developing it by using an alkaline aqueous solution. CONSTITUTION: A light absorbing layer 12 having the specified pattern is formed as a black matrix on a base plate made of glass, for example, on the inner surface of a panel 10 of a color cathode-ray tube. This layer 12 is made of graphite formed by the conventional method. The pigment dispersion liquids for forming blue, green and red filters is prepared. These dispersion liquids contain pigment particles and high molecular electrolytic salt solutions (containing photoresists). The panel 10 is held to the temperature of 30 deg.C, and a blue pigment dispersion liquid is applied thereto, and then a blue pigment layer 20 is obtained. Next, the pattern exposure is performed by using a shadow mask, and the development is performed by using an alkaline aqueous solution, so as to form a blue pigment layer 30B. Similarly, a green pigment layer 30G and a red pigment layer 30R are formed. A blue phosphor layer 40B, a green phosphor layer 40G, and a red phosphor layer 40R are formed by being faced to the pigment layers 30B to 30R.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a filter pattern by patterning a pigment layer in a predetermined pattern. For example, the present invention relates to a method of manufacturing a filter pattern when forming a phosphor layer with a filter of a color cathode ray tube.

[0002]

2. Description of the Related Art Conventionally, a filter pattern formed by patterning a pigment layer into a predetermined pattern has been used in various fields. A color filter of a liquid crystal display device is a typical one. Also in a color cathode ray tube, a filter layer corresponding to the emission color of the phosphor may be provided between the phosphor layer on the front surface of the phosphor layer, that is, on the inner surface of the face plate of the panel to form a phosphor layer with a filter. Known (U.S. Pat. No. 2,959,483, 3,
114,065). A red, blue, and green dot-shaped or stripe-shaped phosphor layer is formed on the inner surface of the face plate of a normal color cathode-ray tube, and the phosphor layer is formed by colliding the phosphor layer with an electron beam. It emits light and an image is displayed. For the phosphor layer with a filter, in order to improve image display characteristics such as contrast and color purity, a filter pattern that transmits light of the same color as the emission color of the phosphor layer is provided between the face plate and the phosphor layer. Of the incident external light, the red pigment absorbs the green or blue component light in the red pigment layer, the green or red component light in the blue pigment layer, and the blue or red component light in the green pigment layer. This is intended to improve the contrast and color purity.

To form such a filter layer,
It is common to pattern by coating and forming a pigment layer on a substrate and then performing exposure and development. At this time, the adhesiveness to the substrate is required at the portion to be left as a pattern, and the peelability is required at the other portions. Further, the pigment layer is required to have transparency, and it is also required that the pigment particles are uniformly dispersed without agglomerating.

[0004]

However, the binding force between the pigment particles and between the pigment and the substrate is relatively strong, and the excess pigment layer is often not left as a residue on the substrate during the development process. Therefore, in the method of developing the pigment layer before it is dried and the binding force becomes strong, there is a problem in that the pattern is broken, that is, the boundary condition between the portion that should be left after exposure and the portion that is not exposed deteriorates.

The present invention has been made to address such a problem, and an object of the present invention is to provide a method of manufacturing a filter pattern which enables easy and reliable patterning.

[0006]

The present invention is a method of manufacturing a filter pattern for solving the above problems, which comprises a step of applying a salt solution of a polymer electrolyte containing pigment particles onto a substrate and drying the solution. Exposing using a pattern,
It is characterized by comprising at least a step of developing with a substance that forms a salt with a polymer electrolyte. Further, the salt solution of the polymer electrolyte contains a photoresist, or instead of containing the photoresist, the photoresist solution is applied and dried between the step of applying and drying the salt solution of the polymer electrolyte and the exposing step. Or a combination of both. Furthermore, the photoresist solution contains a phosphor.

The electrolyte salt solution according to the present invention functions as a dispersant for the pigment particles, prevents the pigment particles from aggregating and disperses them uniformly in the solvent, and when applied and dried on the substrate, the polyelectrolyte salt is formed. Part of the formed groups are dissociated, and the polymer electrolyte contained in the pigment layer becomes insoluble in the solvent (water).
On the other hand, when developing with a solution containing a polyelectrolyte in which a part of the salt has dissociated and a substance that forms a salt again, the polyelectrolyte contained in the pigment layer is solubilized and the peelability is improved. To do. The present invention is based on such knowledge, and in the method of forming the filter layer, the pigment particles are uniformly dispersed, and the non-elution property required at the portion to be left as a pattern and the area other than the exposed portion at the time of development are provided. This is to achieve both the required peelability.

The contents of each will be described below.
The polymer electrolyte according to the present invention is a polymer compound in which a polymer structural unit has a dissociative group, and is also a dispersant for dispersing a pigment. Specifically, acrylic acid-based, acrylic acid-styrene-based acrylic acid copolymers, polymer polycarboxylic acids, styrene-polycarboxylic acid copolymers,
Aromatic sulfonic acid formalin condensates, polyoxyethylene alkyl ether sulfates, sodium salts such as polyoxyethylene alkylphenyl ether sulfates, ammonium salts, amine salts and the like can be mentioned. More specifically, as an acrylic acid type, as Despec N-40 (sodium salt) (made by Allied Colloid), Despec A-40 (ammonium salt) (made as Allied Colloid), and acrylic acid copolymer , Despec G-40 (sodium salt) (manufactured by Allied Colloid), Despec GA-40 (ammonium salt) (manufactured by Allied Colloid), Poise 520 (sodium salt) as high molecular weight polycarboxylic acid (Kaosha) Made), DISCOTE N-14 (ammonium salt) (made by Dai-ichi Kogyo Seiyaku Co., Ltd.), styrene-polycarboxylic acid copolymer oxylac SH-101 (made by Nippon Shokubai Chemical Co., Ltd.),
Hitenol 08 (manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) as an ammonium salt of polyoxyethylene alkyl ether sulfate, and Hitenol N-0 as an ammonium salt of polyoxyethylene alkylphenyl ether sulfate.
8 (manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) and the like. These can be used alone or as a mixture.

Among these, when the pigment layer is formed by the coating and drying method, an easily volatile ammonium salt is preferable, and the ammonium salt of acrylic acid-based or acrylic acid-based copolymer is non-eluting and exfoliated. It is particularly preferable in terms of compatibility with the property.

The pigment according to the present invention may be either an inorganic pigment or an organic pigment. Particularly preferred is a pigment that can be uniformly dispersed in the filter layer of the phosphor layer with a filter, and that allows the filter layer to have sufficient transparency without causing light scattering. When a high temperature process is included in the manufacturing process, such as a color cathode ray tube, an inorganic one is preferable.

The following pigments can be given as specific examples. As a red pigment, ferric oxide-based trade name Sicotrans Red L-2817 (particle diameter 0.01 μm
m-0.02 μm, manufactured by BASF), anthraquinone-based product name Chromophartal Red A2B (particle diameter 0.01 μm, manufactured by Ciba Geigy), and a blue pigment.
Cobalt aluminate (Al ₂ O ₃ —CoO) -based trade name Cobalt Blue X (particle diameter 0.01 μm to 0.02
μm, manufactured by Toyo Pigment Co., Ltd.), a product name of ultramarine blue, ultramarine blue.
8000 (particle diameter 0.3 μm, manufactured by Daiichi Kasei Co., Ltd.), a phthalocyanine blue-based product name Rionol Blue FG-
7370 (particle diameter 0.01 μm, manufactured by Toyo Ink Co., Ltd.), and as a green pigment, TiO ₂ —NiO—CoO—ZnO system under the trade name Dipiroxide TM-Green # 3320.
(Particle diameter 0.01 μm to 0.02 μm, manufactured by Dainichiseika Co., Ltd.), CoO—Al ₂ O ₃ —Cr ₂ O ₃ —TiO ₂ system, trade name Dipyroxide TM-Green # 3340.
(Particle size 0.01 μm to 0.02 μm, manufactured by Dainichiseika Co., Ltd.), CoO—Al ₂ O ₃ —Cr ₂ O ₃ system, trade name DIPIROXIDE TM-Green # 3420 (particle size 0.01 μm to 0) 0.02 μm, manufactured by Dainichiseika Co., Ltd., Cr ₂
O is a ₃ series trade name ND-801 (particle size 0.35μ
m, manufactured by Nippon Denko Co., Ltd., a chlorinated phthalocyanine green type product name Fastgen Green S (particle diameter 0.0)
1 μm, made by Dainippon Ink and Co., Ltd., brominated phthalocyanine green type trade name Fastgen Green 2YK
(Particle diameter 0.01 μm, manufactured by Dainippon Ink and Chemicals, Inc.) and the like.

The concentration of the pigment dispersed in the dispersant comprising the polyelectrolyte is 0.1% by weight to 50% by weight, preferably 1%.
It is in the range of 50% by weight to 50% by weight. When the pigment concentration is less than 0.1% by weight, coloring of the pigment layer is not recognized, and when it exceeds 1% by weight, more distinct coloring is recognized. On the other hand, if it exceeds 50% by weight, the viscosity of the dispersion liquid increases sharply, making it impossible to apply a uniform film.

The ratio of the polyelectrolyte concentration (wt%) to the pigment concentration (wt%) (= polyelectrolyte concentration / pigment concentration) is 0.005-1, preferably 0.01-
It is in the range of 0.5. If the ratio is less than 0.005,
This is because the dispersive power of the pigment particles becomes weak and aggregation of the pigment particles easily occurs, and when it is greater than 1, the coloring power becomes weak and devitrification occurs when baking is performed.

By mixing and stirring the above-mentioned polymer electrolyte and pigment with pure water, a dispersion liquid for forming a pigment layer can be obtained. If the pure water is 10% by weight or less, a water-soluble organic solvent such as alcohol can be included.

The photoresist liquid according to the present invention includes ammonium dichromate (ADC) / polyvinyl alcohol (PVA) and sodium dichromate (SD).
C) / PVA, diazonium salt etc./PVA, stibasol type, ADC / casein etc. water-soluble photoresist can be used.

When the photoresist is contained in the pigment dispersion, the photoresist concentration / polymer electrolyte concentration is
It is 0.005 to 100, and more preferably 0.03 to 30. This is because if it is less than 0.005, the patterning characteristics are deteriorated, especially the sensitivity is low, and if it is more than 100, devitrification occurs and the filter characteristics are deteriorated.

Next, the developing solution in the step of developing the pigment layer will be described. As the developer, an alkaline aqueous solution using a substance that solubilizes the polyelectrolyte that has become insoluble in water or the like by forming a salt again with the polyelectrolyte in which a part of the salt is dissociated can be used. . Examples of such substances include LiCl, LiNO ₃ , NaCl, Na
₂ CO ₃ , Na ₂ S ₂ O ₃ , NaOH, sodium dichromate (SDC), ammonium dichromate (ADC)
There are various salts of alkali metals such as, metal hydroxides, ammonium salts and the like. These can be used alone or in a mixture.

In the present invention, when an ammonium salt of acrylic acid-based or acrylic acid-based copolymer is used as a dispersant, it is preferable as a preferable substance capable of achieving releasability and non-elution of the coated and dried pigment layer. Is an alkali metal salt, preferably a compound containing Li or Na ions having a small ionic radius, and particularly sodium dichromate (S
DC) is preferred.

In order to obtain good pattern characteristics, PH
It is preferable to use an alkaline aqueous solution having a pH of 8.5 or more, and particularly preferable to use an alkaline aqueous solution having a pH of 9.5 or more.

The manufacturing method of the present invention is performed in the following procedure. First, a pigment dispersion containing a pigment particle and a polymer electrolyte pigment dispersion as a dispersant as main components is applied onto a substrate. The coating method may be appropriately selected in consideration of the shape and size of the substrate, and a spin coating method, a roller method, a dipping method or the like can be used. The spin coating method is particularly preferable in order to obtain a uniform and predetermined film thickness. Next, it is dried. As a drying method, various methods can be adopted without particular limitation as long as the water can be volatilized and a part of the salt in the polymer electrolyte salt can be dissociated. For example, drying with a heater, drying with hot air, and long-time drying at room temperature can be used.

In order to perform patterning only with the pigment layer, the pigment dispersion may contain a photoresist. If a pigment layer containing a photoresist is formed by coating in this way, the portion irradiated with light by exposure using a high-pressure mercury lamp or the like hardens. After that, by forming a salt again with the polyelectrolyte in which a part of the salt is dissociated,
By exposing with an alkaline aqueous solution containing a substance that solubilizes the polymer electrolyte that has become insoluble in water,
A predetermined filter pattern can be obtained. Further, when the exposure / development is performed after forming the photoresist layer after coating and drying the pigment layer, instead of including the photoresist in the pigment dispersion liquid, the photosensitivity is improved, that is, the exposure time is increased. The length is shortened to improve the adhesion, and the thickness range of the formed filter layer is expanded.

When a color filter layer of a plurality of colors, usually three colors of red, green and blue, is formed, the above steps may be repeated for each color.

Further, in order to obtain a color cathode ray tube having a phosphor screen with a filter, in which a phosphor layer is laminated on a filter layer, a pigment mask is applied through a shadow mask during exposure after coating and drying. Then, the phosphor layer may be exposed in a predetermined pattern, and then the phosphor layer may be formed by an ordinary and conventionally known method after forming the filter layers of three colors. In the method of coating and drying the above-mentioned pigment layer and then stacking and exposing the photoresist layer, if the photoresist solution contains a phosphor layer, the pigment layer and the phosphor layer are patterned at the same time. It can be carried out.

[0024]

According to the present invention, in forming a pigment layer on a substrate, when a salt of a polyelectrolyte is used as a dispersant and is applied and dried, a part of the salt in the polyelectrolyte is dissociated, resulting in the pigment. The layer is less soluble in the solvent (water). For example,
In the polyacrylic acid ammonium salt, polyacrylic acid is formed and becomes insoluble in water. On the other hand, when the developer contains Li or Na ions that form a salt again with the polymer electrolyte, these ions diffuse into the pigment layer and substitute with the salt of the polymer electrolyte to become soluble in the solvent. it is conceivable that. For example, the above-mentioned polyacrylic acid becomes polyacrylic acid sodium salt and becomes soluble in water. Therefore, the releasability in patterning by development is improved. The portion that should be left as a pattern remains on the substrate as it is without being peeled off by development, because the resist formed in or on the pigment layer is cured by exposure.

[0025]

Embodiments of the present invention will be described below with reference to the drawings. In addition, an Example demonstrates the case where a fluorescent screen with a filter of a color cathode ray tube is manufactured. Embodiment 1 FIGS. 1 and 2 are views showing steps of an embodiment of the present invention. Basically, a filter pattern for one color can be formed in the steps A to E of FIG. When forming a filter pattern of a plurality of colors, these steps A to E may be repeated for each color.

First, as shown in FIG. 2A, a light absorption layer 12 having a predetermined pattern as a black matrix is formed on the inner surface of the panel 10 of the color cathode ray tube, which is made of, for example, glass. This light absorption layer can be formed by a conventionally known method. That is, a resist is applied on a substrate, exposed through a shadow mask, developed, and dried to leave a stripe-shaped or dot-shaped photo-cured film on a portion where a pigment layer and a phosphor layer are to be formed. After applying a light-absorbing substance, for example, graphite, to bind it, wash it with hydrogen peroxide solution to dissolve the photo-cured film, remove the light-absorbing layer and the light-absorbing substance, and remove the pigment layer. Also, the hole portion, which is the portion where the phosphor layer is to be formed, is exposed to form the patterned light absorption layer 12.

Next, a pigment dispersion having the following composition was prepared as a pigment dispersion for forming blue, green and red filters.

The blue pigment dispersion contains cobalt aluminate (trade name Cobalt Blue X (particle size 0.0
1 μm to 0.02 μm, manufactured by Toyo Pigment Co., Ltd.) 30% by weight,
Ammonium dichromate as a photoresist (AD
C) + polyvinyl alcohol (PVA) 0.5% by weight, and 0.7% by weight of ammonium salt of polyacrylic acid copolymer (Despec GA-40, manufactured by Allied Colloid Co., Ltd.) as a polymer electrolyte. It was prepared by dispersing in water. At this time, the polymer electrolyte concentration / pigment concentration ratio was 0.023, and the resist concentration / polymer electrolyte concentration was 0.
714, and the resist concentration / pigment concentration is 0.017.

The green pigment dispersion contains TiO as green pigment particles.
_2- NiO-CoO-ZnO (trade name Typyroxide TM Green # 3320 (particle size 0.01 μm to 0.0
2 μm, manufactured by Dainichiseika Co., Ltd., 30% by weight, ADC + PVA as a photoresist, 2% by weight, sodium salt of acrylic acid as a polymer electrolyte (trade name: Despec N-4)
0) was prepared by dispersing 0.7% by weight in pure water. At this time, the polymer electrolyte concentration / pigment concentration ratio was 0.
023, the resist concentration / polymer electrolyte concentration is 2.85
7. The resist concentration / pigment concentration is 0.067.

The red pigment dispersion contains Fe ₂ as red pigment particles.
30% by weight of O ₃ fine particles (particle diameter 0.01 μm to 0.02 μm), and ADC + PVA as a photoresist 2
%, And 0.7% by weight of ammonium salt of polyoxyethylene alkyl ether sulfate (Hitenol 08, manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) as a polymer electrolyte were prepared by dispersing in pure water. At this time, the polymer electrolyte concentration / pigment concentration ratio is 0.023, the resist concentration / polymer electrolyte concentration is 2.857, and the resist concentration / pigment concentration is 0.067.

The coating step A and the drying step B were performed by the following method. The panel 10 of the color cathode ray tube as the substrate was kept at a temperature of 30 ° C., and the blue pigment dispersion liquid was applied first. Next, the panel 10 is 100-150 rp
Rotate at m to shake off excess pigment dispersion to form a coating layer having a constant film thickness. After that, heater temperature 120 ℃
And dried for 3 to 4 minutes to obtain a blue pigment coating layer 20B as shown in FIG. 2 (b).

The pattern exposure step C was performed by the following method. As shown in FIG. 2C, a high-pressure mercury lamp was used to expose a predetermined pattern through a shadow mask (not shown).

The developing step D and the drying step E were performed by the following method. Atomized, for example, with PH9, NaO
By developing a developing solution composed of an alkaline aqueous solution containing H at a developing solution pressure of ² to 10 kg / cm ² to develop, a blue pigment layer 30B having a predetermined pattern as shown in FIG. 2 (d). Was formed.

Next, a green pigment layer and a red pigment layer are formed in the same manner as the above-mentioned blue pigment layer forming step. At this time, the developer used was an alkaline aqueous solution containing LiCl in both the green pigment layer and the red pigment layer. Thus, as shown in FIG. 2E, a filter pattern including the blue pigment layer 30B, the green pigment layer 30G, and the red pigment layer 30R was obtained on the inner surface of the panel 10.

Next, as shown in FIG. 2 (f), the blue phosphor layer 40B, the green phosphor layer 40G, and the red phosphor layer 40R are respectively subjected to a blue pigment layer 30B, a green pigment layer 30G, and a green pigment layer 30G by an ordinary method. It was formed so as to correspond to the red pigment layer 30R.

The phosphor suspension used had the following composition. The blue phosphor suspension is a blue phosphor (ZnS: A
g, Cl) 100 g, polyvinyl alcohol 5 g, ammonium dichromate 0.30 g, surfactant 0.01
g, and 140 g of pure water were mixed and stirred. The green phosphor suspension is 100 g of green phosphor (ZnS: Cu, Al),
8 g of polyvinyl alcohol, 0.40 g of ammonium dichromate, 0.01 g of a surfactant, and 160 g of pure water were mixed and stirred. The blue phosphor suspension is prepared by mixing 100 g of the red phosphor (Y ₂ O ₂ S: Eu), 10 g of polyvinyl alcohol, 0.50 g of ammonium dichromate, 0.01 g of a surfactant, and 190 g of pure water with stirring. did.

In this way, it is possible to obtain a desired phosphor layer with a filter having a pigment layer and a phosphor layer on the substrate 10, and a color cathode ray tube using this has excellent contrast and color purity characteristics. Was there. Further, a blue pattern is formed corresponding to a predetermined position of the filter pattern, for example, a position where the blue phosphor layer is to be formed,
The pigment particles of the blue filter did not remain as a residue at the positions of other colors, and there was no color mixing in the filter, and the color purity characteristics were excellent.

Second Embodiment Next, a second embodiment will be described with reference to FIGS. 3 and 4. The process flow of this embodiment is as shown in FIG. 3, and the process of FIG. 3 is repeated when forming a filter pattern of a plurality of colors. First, a panel on which a black matrix is formed is prepared in the same manner as in Example 1 above.

Pigment dispersion coating step F and drying step B
Was performed by the following method. A pigment dispersion having the following composition was prepared as a pigment dispersion for forming blue, green and red filters. This contains no photoresist compared to the pigment dispersion used in Example 1 above. The blue pigment dispersion contains cobalt aluminate (trade name Cobalt Blue X (particle diameter 0.01 μm-
0.02 μm, manufactured by Toyo Pigment Co., Ltd., 30% by weight, ammonium salt of polyacrylic acid copolymer as polymer electrolyte (Despec GA-40, manufactured by Allied Colloid Co., Ltd.)
Was prepared by dispersing 0.7% by weight in pure water. At this time, the polymer electrolyte concentration / pigment concentration ratio is 0.0
It is 23.

The green pigment dispersion contains TiO as green pigment particles.
_2- NiO-CoO-ZnO (trade name Typyroxide TM Green # 3320 (particle size 0.01 μm to 0.0
2 μm, manufactured by Dainichiseika Co., Ltd., 30% by weight, sodium salt of acrylic acid as a polymer electrolyte (trade name: Despec N)
-40) was dispersed in pure water in an amount of 0.7% by weight. At this time, the polymer electrolyte concentration / pigment concentration ratio is 0.023.

The red pigment dispersion contains Fe ₂ as red pigment particles.
20% by weight of O ₃ fine particles (particle diameter 0.01 μm to 0.02 μm) and 0.7% by weight of polyoxyethylene alkyl ether sulfate ammonium salt (Hitenol 08, manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) as a polymer electrolyte. %, And were dispersed in pure water. At this time, the polymer electrolyte concentration / pigment concentration ratio is 0.035.

As in Example 1, the panel 10 was heated to a temperature of 30.
The blue pigment dispersion liquid was first applied while maintaining the temperature at 0 ° C. Then, the panel 10 was rotated at 100 to 150 rpm to shake off excess pigment dispersion. It was dried at a heater temperature of 120 ° C. for 3 to 4 minutes to obtain a blue pigment layer.

Resist solution coating step G1 and drying step H
Was performed by the following method. Prepare a photoresist solution having a composition in which polyvinyl alcohol is 3% by weight, ammonium dichromate is 0.20% by weight, a surfactant is 0.01% by weight, and pure water is the rest, and the same as in the pigment layer formation. By coating and drying by the method, as shown in FIG. 4B, a photoresist layer 24 is laminated on the blue pigment layer 22B.

The pattern exposure step C was performed by the following method. As shown in FIG. 4C, a predetermined pattern was exposed using a high pressure mercury lamp through a shadow mask (not shown). In this embodiment, the exposure time is ⅕ as compared with the method of mixing the dye and the resist as in the first embodiment.

The developing step D was performed by the following method.
A nebulized PH 9 solution, for example, is used as a developer solution of an alkaline aqueous solution containing Na ₂ CO ₃ at a developer pressure of 2 to 10 k.
Development by spraying at g / cm ²
As shown in (d), the blue pigment layer 22B and the resist layer 2
4 formed a laminated pattern. Next, a green pigment layer and a red pigment layer are formed in the same manner as the blue pigment layer forming step described above. At this time, the developer is Na ₂ CO ₃ for the green pigment layer.
Was used, and an aqueous alkaline solution containing Na ₂ CO ₃ was used for the red pigment layer. In this way, a filter pattern including the blue pigment layer 22B, the green pigment layer 22G and the red pigment layer 22R was obtained on the inner surface of the panel 10 as shown in FIG. 4 (e).

Next, after peeling off the resist layer 24 on each of the blue, green and red pigment layers, the ordinary method shown in FIG.
As shown in (f), phosphor layers 42B, 42G, 42R are formed. The phosphor suspension used is the same as in Example 1 above.
Is the same as Thus, a desired phosphor layer with a filter having a pigment layer and a phosphor layer on the inner surface 1 of the panel is obtained, and the color cathode ray using the phosphor layer has excellent contrast and color purity. Furthermore, the filter pattern has a predetermined position, for example, a blue filter is formed corresponding to the position where the blue phosphor layer is to be formed, and the pigment particles of the blue filter do not remain as a residue at positions of other colors, It is a filter with no color mixture and excellent color purity characteristics.

In the first embodiment, if the sensitivity to exposure is attempted to be improved, the ratio of the resist to the pigment is increased and the transparency may be deteriorated. On the other hand, in this embodiment, since the resist layer is separately provided, the exposure sensitivity can be significantly improved without affecting the transparency of the pigment layer. Since the portion of the pigment layer that remains insoluble by drying as a pattern is covered with the resist layer, it is not soluble in the developing solution and does not affect the patterning characteristics.

Example 3 In Example 2, the resist layer is formed on the pigment layer and the pigment layer of each color is patterned, and then the phosphor layer of each color is formed. However, the resist layer contains a phosphor. If so, the pigment layer and the phosphor layer can be patterned at the same time.
This embodiment will be described with reference to FIGS. 5 and 6. In this embodiment, since the phosphor layer with a filter for one color can be formed in the steps F, B, G2, H, C, D and E of FIG.
A fluorescent screen for color display can be formed simply by repeating the process of FIG. 5 for each color.

The pigment layer coating step F and the drying step B were performed by the following methods. First, a pigment dispersion similar to that in Example 2 and a phosphor suspension similar to Example 1 are prepared for each color. Next, as shown in FIG. 6A, the light absorption layer 1
The blue pigment dispersion is applied onto the panel 10 on which No. 2 is formed by the same method as in Example 2 above and dried to form a blue pigment layer.

The phosphor-containing resist coating step G2 and the drying step H were performed by the following method. The blue phosphor suspension is applied and dried on the substrate on which the blue pigment layer is formed.
As shown in (b), the phosphor-containing resist layer 42B is laminated on the pigment layer 22B.

The pattern exposure step H was performed by the following method. As shown in FIG. 6C, a predetermined pattern was exposed using a high pressure mercury lamp through a shadow mask (not shown).

The developing step D was performed by the following method.
For example, in a nebulized PH9, a developing solution composed of an alkaline aqueous solution containing NaOH is applied at a developing solution pressure of 2 to 10 kg /
developed by spraying at cm ² , FIG. 6 (d)
As shown in, a laminated pattern of the blue pigment layer 22B and the blue phosphor layer 42B was formed. Next, a green pigment / phosphor layer and a red pigment / phosphor layer are formed in the same manner as the above-mentioned blue pigment layer forming step. At this time, the developer is Na for the green pigment layer.
An alkaline aqueous solution containing OH was used, and an alkaline aqueous solution containing NaOH + NaCl was used for the red pigment layer. Forming in this way can reduce the number of exposure steps as compared with the first and second embodiments, which is desirable in terms of equipment.

In the above embodiment, the case where the fluorescent screen with the filter of the color cathode ray tube is formed has been described.
The present invention is not limited to the above embodiment, but can be applied to the case where a filter layer patterned into a predetermined pattern is formed.

Further, in the present invention, the patterning characteristics are improved by adding a substance forming a salt again with the polymer in which a part of the salt in the pigment layer is dissociated in the developing solution. 2. When the resist-containing layer is laminated on the pigment layer as in Example 3, the resist-containing layer may contain the substance in the developing solution. However, when such a substance is contained and laminated on the pigment layer,
Since there is a possibility that the lower pigment layer is solubilized before the resist layer is cured by light irradiation by exposure, it is preferable to use a developing solution.

In the above examples, the pigment layers were formed in the order of blue, green and red, but it goes without saying that the order is not limited to this. Further, the present invention may be applied not only to the pigment layer but also to the formation of the phosphor layer.

[0056]

The method for producing a filter pattern according to the present invention comprises a step of coating and drying a pigment particle and a salt solution of a polymer electrolyte, exposing to a predetermined pattern, and developing with an alkaline aqueous solution. , The patterning property at the boundary between the part that should be exposed as a pattern and the part that is not exposed and is peeled off becomes good, and since there is no pigment residue, the predetermined pattern of the pigment layer can be reliably obtained by a simpler process than in the past. it can.

[Brief description of drawings]

FIG. 1 is a process drawing showing a first embodiment of the present invention.

FIG. 2 is a diagram showing a process of forming a phosphor layer with a filter by the process of FIG.

FIG. 3 is a process drawing showing a second embodiment of the present invention.

FIG. 4 is a diagram showing a process of forming a phosphor layer with a filter by the process of FIG.

FIG. 5 is a process drawing showing a third embodiment of the present invention.

FIG. 6 is a diagram showing a process of forming a phosphor layer with a filter by the process of FIG.

[Explanation of symbols]

10 ... Substrate, 12 ... Black matrix, 30B,
22B ... Blue pigment layer, 30G, 22G ... Green pigment layer, 30R, 22R ... Red pigment layer, 40B, 42B ...
... Blue phosphor layer, 40G, 42G ... Green phosphor layer, 4
0R, 42R ... Red phosphor layer.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takashi Chigusa 1-9-2 Harara-cho, Fukaya-shi, Saitama Inside Fukaya Electronics Factory, Toshiba Corp. (72) Inventor Kazuo Sakai 2-chome, 23-2 Obana, Kawanishi-shi, Hyogo Fuji dye company (72) Inventor Katsu Fukuda 2-23-2 Obana, Kawanishi city, Hyogo prefecture Fuji dye company

Claims (5)

[Claims] 1. A method for producing a filter pattern, which comprises a step of forming a pigment layer on a substrate, a step of exposing the pigment layer to light of a predetermined pattern, and a step of developing the pigment layer on the substrate. The step of forming is a step of coating and drying a salt solution of a polymer electrolyte containing pigment particles on a substrate, and the developing step is developed using a solution containing a substance that forms a salt with the polymer electrolyte. A method of manufacturing a filter pattern, which is characterized by being a step. 2. The method for producing a filter pattern according to claim 1, wherein the salt solution of the polymer electrolyte contains a photoresist. 3. The method for producing a filter pattern according to claim 1, further comprising a step of applying and drying a solution containing a photoresist between the step of applying and drying the salt solution of the polymer electrolyte and the exposing step. A method of manufacturing a filter pattern, comprising: 4. The method of manufacturing a filter pattern according to claim 3, wherein the solution containing the photoresist also contains a phosphor. 5. The method of manufacturing a filter pattern according to claim 3, wherein the filter pattern is provided on an inner surface of a panel of a color cathode ray tube.